Consider the following subroutine in Fortran 77: subroutine shift(a, b, c) integer a, b, c a =
Question:
Consider the following subroutine in Fortran 77:
subroutine shift(a, b, c)
integer a, b, c
a = b
b = c
end
Suppose we want to call shift(x, y, 0) but we don’t want to change the value of y. Knowing that built-up expressions are passed as temporaries, we decide to call shift(x, y+0, 0). Our code works fine at first, but then (with some compilers) fails when we enable optimization. What is going on? What might we do instead?
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